package com.heima.article.stream;


import com.alibaba.fastjson.JSON;
import com.heima.common.constants.HotArticleConstants;
import com.heima.model.mess.ArticleVisitStreamMess;
import com.heima.model.mess.UpdateArticleMess;
import lombok.extern.slf4j.Slf4j;
import org.apache.kafka.streams.KeyValue;
import org.apache.kafka.streams.StreamsBuilder;
import org.apache.kafka.streams.kstream.*;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.time.Duration;

@Configuration
@Slf4j
public class HotArticleStreamHandler {

    @Bean
    public KStream<String,String> kStream(StreamsBuilder streamsBuilder){
        //接收消息
        KStream<String,String> stream = streamsBuilder.stream(HotArticleConstants.HOT_ARTICLE_SCORE_TOPIC);
        //聚合流式处理
        stream.map((key, value) -> {
                    System.out.println(key + " : " + value);
            UpdateArticleMess mess = JSON.parseObject(value, UpdateArticleMess.class);
                    //重置消息的key:1234343434   和  value: likes:1
            return new KeyValue<>(mess.getArticleId().toString() , mess.getType() + ":" + mess.getAdd());
                    //按照文章id进行聚合
        }).groupBy(((key, value) -> key))
                //时间窗口
                .windowedBy(TimeWindows.of(Duration.ofSeconds(10)))
                //自行的完成聚合的计算
                .aggregate(

                        //初始方法，返回值是消息的value
                        new Initializer<String>() {
                    @Override
                    public String apply() {
                        return  "COLLECTION:0,COMMENT:0,LIKES:0,VIEWS:0";
                    }
                    //真正的聚合操作，返回值是消息的value
                }, new Aggregator<String, String, String>() {
                    @Override
                    public String apply(String key, String value, String aggregate) {

                        int col = 0,com=0,lik=0,vie=0;
                        //获得初始值，也是时间窗口内计算之后的值
                        String[] aggArg = aggregate.split(",");
                        for (String str : aggArg) {
                            String[] split = str.split(":");
                            switch (UpdateArticleMess.UpdateArticleType.valueOf(split[0])){
                                case COLLECTION:
                                    col = Integer.parseInt(split[1]);
                                    break;
                                case COMMENT:
                                    com = Integer.parseInt(split[1]);
                                    break;
                                case LIKES:
                                    lik = Integer.parseInt(split[1]);
                                    break;
                                case VIEWS:
                                    vie = Integer.parseInt(split[1]);
                                    break;
                            }
                        }

                        // 累加操作
                        String[] split = value.split(":");
                        switch (UpdateArticleMess.UpdateArticleType.valueOf(split[0])){
                            case COLLECTION:
                                col += Integer.parseInt(split[1]);
                                break;
                            case COMMENT:
                                com += Integer.parseInt(split[1]);
                                break;
                            case LIKES:
                                lik += Integer.parseInt(split[1]);
                                break;
                            case VIEWS:
                                vie += Integer.parseInt(split[1]);
                                break;
                        }
                        String formatStr = String.format("COLLECTION:%d,COMMENT:%d,LIKES:%d,VIEWS:%d", col, com, lik, vie);
                        System.out.println("文章的id:"+key);
                        System.out.println("当前时间窗口内的消息处理结果："+formatStr);
                        return formatStr;
                    }
                } , Materialized.as("hot-atricle-stream-count-001"))
                .toStream()
                .map((key , value) -> {
                    return new KeyValue<>(key.key().toString(),formatObj(key.key().toString(),value));
                })
                .to(HotArticleConstants.HOT_ARTICLE_INCR_HANDLE_TOPIC);
        return stream;
    }

    /**
     * 格式化消息的value数据
     * @param key
     * @param value
     * @return
     */
    private String formatObj(String key, String value) {
        ArticleVisitStreamMess streamMess = new ArticleVisitStreamMess();
        streamMess.setArticleId(Long.parseLong(key));
        String[] valAry = value.split(",");
        for (String val : valAry) {
            String[] split = val.split(":");
            switch (UpdateArticleMess.UpdateArticleType.valueOf(split[0])){
                case COLLECTION:
                    streamMess.setCollect(Integer.parseInt(split[1]));
                    break;
                case COMMENT:
                    streamMess.setComment(Integer.parseInt(split[1]));
                    break;
                case LIKES:
                    streamMess.setLike(Integer.parseInt(split[1]));
                    break;
                case VIEWS:
                    streamMess.setView(Integer.parseInt(split[1]));
                    break;
            }
        }


        return JSON.toJSONString(streamMess);

    }

}
